PDFAexportert which could detect the PDF-Version in the load methods …

…and accordingly mimic either a A1 or A3 exporter by putting the correct one into a internal var like theExporter

library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDExporterFromPDFA.java

@@ -0,0 +1,122 @@
+/** **********************************************************************
+ *
+ * Copyright 2018 Jochen Staerk
+ *
+ * Use is subject to license terms.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy
+ * of the License at http://www.apache.org/licenses/LICENSE-2.0.
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ *********************************************************************** */
+package org.mustangproject.ZUGFeRD;
+
+
+import org.apache.pdfbox.preflight.PreflightDocument;
+import org.apache.pdfbox.preflight.exception.ValidationException;
+import org.apache.pdfbox.preflight.parser.PreflightParser;
+import org.mustangproject.EStandard;
+
+import javax.activation.DataSource;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+public class ZUGFeRDExporterFromPDFA implements IZUGFeRDExporter {
+	protected IZUGFeRDExporter theExporter=null;
+
+
+	public IZUGFeRDExporter load(String pdfFilename) throws IOException {
+		return (IZUGFeRDExporter)theExporter.load(pdfFilename);
+	}
+
+	/**
+	 * Makes A PDF/A3a-compliant document from a PDF-A1 compliant document (on the
+	 * metadata level, this will not e.g. convert graphics to JPG-2000)
+	 *
+	 * @param pdfBinary binary of a PDF/A1 compliant document
+	 * @return the generated exporter
+	 * @throws IOException (should not happen at all)
+	 */
+	public IZUGFeRDExporter load(byte[] pdfBinary) throws IOException{
+		return theExporter.load(pdfBinary);
+	}
+
+
+	/**
+	 * Makes A PDF/A3a-compliant document from a PDF-A1 compliant document (on the
+	 * metadata level, this will not e.g. convert graphics to JPG-2000)
+	 *
+	 * @param pdfSource source to read a PDF/A1 compliant document from
+	 * @throws IOException if anything is wrong with inputstream
+	 * @return the generated ZUGFeRDExporter
+	 */
+	public IZUGFeRDExporter load(InputStream pdfSource) throws IOException {
+		return theExporter.load(pdfSource);
+	}
+	public IZUGFeRDExporter setCreator(String creator)
+	{
+		return theExporter.setCreator(creator);
+	}
+	public IZUGFeRDExporter setConformanceLevel(PDFAConformanceLevel newLevel){
+		return theExporter.setConformanceLevel(newLevel);
+	}
+	public IZUGFeRDExporter setProducer(String producer) {
+		return theExporter.setProducer(producer);
+	}
+	public IZUGFeRDExporter setZUGFeRDVersion(int version) {
+
+			return theExporter.setZUGFeRDVersion(version);
+
+	}
+	public boolean ensurePDFIsValid(final DataSource dataSource) throws IOException {
+		return theExporter.ensurePDFIsValid(dataSource);
+	}
+	public IZUGFeRDExporter setXML(byte[] zugferdData) throws IOException {
+		return theExporter.setXML(zugferdData);
+	}
+	public IZUGFeRDExporter disableFacturX() {
+		return theExporter.disableFacturX();
+	}
+	//	public IZUGFeRDExporter setProfile(Profile zugferdConformanceLevel);
+	public String getNamespaceForVersion(int ver) {
+		return theExporter.getNamespaceForVersion(ver);
+	}
+	public String getPrefixForVersion(int ver) {
+		return theExporter.getPrefixForVersion(ver);
+	}
+	public IZUGFeRDExporter disableAutoClose(boolean disableAutoClose) {
+		return theExporter.disableAutoClose(disableAutoClose);
+	}
+	public IXMLProvider getProvider() {
+		return theExporter.getProvider();
+	}
+
+	@Override
+	public void close() throws IOException {
+		theExporter.close();
+	}
+
+	@Override
+	public IExporter setTransaction(IExportableTransaction trans) throws IOException {
+		return theExporter.setTransaction(trans);
+	}
+
+	@Override
+	public void export(String ZUGFeRDfilename) throws IOException {
+		theExporter.export(ZUGFeRDfilename);
+	}
+
+	@Override
+	public void export(OutputStream output) throws IOException {
+		theExporter.export(output);
+	}
+}
+